The World's Shipbuilding Map and Its Engine Map Are Not the Same
China is now unquestionably the world's largest shipbuilding country.
Clarksons data show that Chinese shipyards captured approximately 63% of global newbuilding orders by CGT in 2025, compared with about 21% for South Korea.
But the marine engine industry tells a different story.
Large commercial ships such as container vessels, tankers, bulk carriers and LNG carriers generally use low-speed two-stroke engines because they offer exceptionally high thermal efficiency and can drive the propeller directly without a reduction gearbox.
In this market, South Korea remains a global powerhouse.
South Korea Still Produces More Than Half of the World's Low-Speed Engines
South Korea has three major large low-speed marine engine builders:
- HD Hyundai Heavy Industries
- Hanwha Engine
- HD Hyundai Marine Engine
Korean corporate filings state that these three manufacturers have historically supplied more than 50% of global low-speed marine engine production on average.
HD Hyundai Heavy Industries alone describes itself as the world's largest marine engine manufacturer and says that it accounts for roughly one-third of global low-speed engine supply. Other HD Hyundai corporate material has placed its share around 35%.
Its scale is enormous.
HD Hyundai Heavy Industries reported annual ship-engine production capacity of approximately 16 million BHP in 2025, while the HD Hyundai Marine Engine operation added almost another one million BHP of capacity.
Hanwha Engine also remains one of the world's leading large low-speed engine manufacturers, with a particularly strong position in large merchant vessels and environmentally advanced dual-fuel engines.
Japan Is Smaller in Volume, but Still Important in Technology
Japan's shipbuilding industry is smaller than it was during its peak decades, and its marine engine production volume has declined accordingly.
But Japan remains an important low-speed engine technology country.
Mitsui E&S is one of the world's most experienced large marine engine manufacturers. For the fiscal year ending March 2026, the company projected production of approximately 146 large marine engines totaling 3.16 million horsepower.
The Mitsui E&S Group, including Mitsui E&S DU and sublicensees such as Makita, held approximately 71% of Japan's domestic large marine engine market in 2024.
Japan also has something strategically unusual.
Japan Engine Corporation, or J-ENG, retains its own UE low-speed engine technology.
Most Korean and Chinese large two-stroke engines are manufactured under licenses from Everllence or WinGD. J-ENG therefore represents one of the few remaining independent large low-speed engine design platforms in the world.
Japan is also investing aggressively in ammonia and hydrogen combustion technology, suggesting that its future position may depend more on intellectual property and next-generation propulsion than on sheer production volume.
China's Low-Speed Engine Industry Is Catching Up Quickly
China presents a more complicated statistical picture.
There is no single, directly comparable audited national figure showing annual Chinese low-speed engine production in units in the same format used by Korean or Japanese manufacturers.
DATAAD therefore believes it is better not to present an artificial country total.
What is clear is that China's production base is expanding rapidly.
CSSC operates multiple major two-stroke engine manufacturing companies, while independent and private manufacturers are entering the market.
For example, Jiangsu Duokai became China's fourth private manufacturer licensed to build large Everllence low-speed engines and had accumulated orders for more than 80 engines extending into 2028 shortly after starting production.
CSSC Engine's Dalian operation passed the milestone of 1,500 cumulative main-engine deliveries in 2025.
China is also moving rapidly into alternative fuels. In May 2026, Yuchai Marine Power announced delivery of China's first domestically produced ammonia dual-fuel low-speed engine.
The direction is therefore clear:
China is not satisfied with dominating shipbuilding. It wants to localize the high-value propulsion equipment inside those ships as well.
A More Honest Comparison of the Three Countries
| Country | Low-Speed Engine Position | Public Production Indicator | Strategic Strength |
|---|---|---|---|
| South Korea | Global leader | 3 major makers collectively supply more than 50% of world production on average | Large-bore, high-output and dual-fuel engines |
| China | Rapidly expanding | No directly comparable national audited unit total; multiple CSSC and private production sites expanding | Massive domestic shipbuilding demand and localization |
| Japan | Smaller volume | Mitsui E&S: about 146 units / 3.16 million hp forecast for FY ending March 2026 | Independent IP, precision engineering, ammonia and hydrogen technology |
The numbers also illustrate why counting engines alone can be misleading.
A low-speed engine for a very large LNG carrier or 20,000-plus-TEU container ship can be dramatically larger and more valuable than an engine powering a small bulk carrier.
Korea's strength is particularly concentrated in these high-value vessels.
Then Comes the Battery
The maritime battery market is now moving much faster than many people realize.
Bureau Veritas reported in April 2026 that the global fleet already included:
| Propulsion Type | In Service | On Order |
|---|---|---|
| Full Battery Propulsion | 252 vessels | 59 vessels |
| Battery Hybrid Propulsion | 1,105 vessels | 453 vessels |
That means battery technology is no longer an experimental niche.
It is already an established part of commercial maritime propulsion.
However, most fully electric vessels are still ferries, harbor craft, tugs, workboats and short-sea vessels that can recharge frequently.
Large ocean-going ships remain fundamentally different because their energy requirements are enormous.
Is Marine Battery Propulsion Moving Toward LFP?
Increasingly, yes — but the answer requires some nuance.
Historically, NMC lithium-ion batteries were the most widely used chemistry in hybrid and fully electric marine propulsion.
NMC offers higher specific energy than LFP, which means more energy can be stored for a given battery weight and volume.
This remains an important advantage on ships where space and weight are limited.
But LFP is gaining rapidly.
DNV notes that falling cell prices — particularly for Lithium Iron Phosphate, or LFP — combined with improvements in lifetime, safety and energy density are strengthening the economic case for maritime hybrid systems.
Why LFP Is Attractive at Sea
LFP has several characteristics that match maritime requirements particularly well:
- High thermal stability
- Lower thermal-runaway risk compared with many nickel-rich chemistries
- Long cycle life
- No cobalt
- Relatively low cell cost
- Good tolerance of repeated charge and discharge cycles
A ship is not a passenger car.
The lowest possible battery weight is important, but reliability, fire safety and the ability to operate for many years can be even more important.
This makes LFP particularly attractive when the vessel has enough space to accept its lower energy density.
A 25 MWh LFP Marine Battery Is Already Being Built
A useful example is the Bibby Marine electric Commissioning Service Operation Vessel scheduled to enter service in 2027.
Corvus Energy is supplying a battery system of almost 25 MWh using its Blue Whale LFP technology.
Corvus describes it as the largest LFP battery installation yet delivered for a maritime project.
The shipowner specifically selected LFP because of its combination of safety, longevity and reliability.
Corvus also launched its next-generation Blue Whale marine ESS using cobalt-free LFP cells, targeting large ships where long-duration energy storage is more important than extreme discharge power.
This is a strong indication of where large marine ESS chemistry is moving.
But NMC Has Not Disappeared
LFP should not be interpreted as the universal marine battery.
Corvus Energy's widely deployed Orca ESS, for example, continues to use NMC/graphite chemistry and can support charge and discharge rates of up to 3C.
NMC's higher energy density makes it attractive where the available battery room is small or vessel weight is especially important.
This is why both chemistries are likely to coexist.
| Chemistry | Main Advantage | Main Limitation | Likely Marine Role |
|---|---|---|---|
| LFP | Safety, cost, cycle life | Lower energy density | Large ESS, ferries, offshore vessels, hybrid ships |
| NMC | Higher energy density and strong power capability | Higher thermal-management requirements | Weight/space-sensitive hybrid and electric ships |
| LTO | Very fast charging, extreme cycle life and strong power | Low energy density and high cost | Tugs, ferries and intensive short-cycle operations |
LTO Shows Why the Mission Profile Matters
Singapore's fully electric harbor tug EON provides another useful example.
The tug uses a 3 MWh LTO battery system rather than LFP or NMC.
The reason is its operating profile.
A harbor tug requires repeated high-power operation, rapid charging and an extremely high number of battery cycles.
LTO's relatively poor energy density is acceptable because the vessel does not need to cross an ocean.
This illustrates a fundamental principle of marine electrification:
The best battery chemistry is determined by the vessel's mission, not by a single global battery trend.
HD Hyundai Is Already Offering Both LFP and NMC
HD Hyundai's broader electrification portfolio provides another interesting signal.
Its industrial and marine-capable battery modules and packs include both LFP and NMC products.
Current HD Hyundai electrification products include LFP packs ranging beyond 180 kWh with liquid cooling and heating, while NMC packs remain available for applications requiring different power and energy-density characteristics.
HD Hyundai's own sustainability material explains the division clearly:
NMC is suitable for applications requiring high output and energy density, while LFP is being expanded into construction, industrial and marine applications because of its long lifetime, safety and fast-charging characteristics.
This does not mean that every HD Hyundai hybrid ship uses LFP.
But it shows that Korea's largest marine industrial group clearly sees LFP as an important part of its future marine electrification portfolio.
HD Hyundai Has Already Put Battery Hybrid Propulsion to Sea
In March 2025, HD Hyundai Mipo delivered Chaumine, Korea's first 25,000 DWT hybrid-propulsion Ro-Ro vessel.
The vessel combines diesel engines with a large battery system.
A shaft generator and the battery can provide Power Take Home propulsion, improving fuel economy and providing additional propulsion capability during emergencies.
This is important because it demonstrates that battery hybridization is not simply a laboratory concept.
It is already operating in a commercially delivered Korean vessel.
Then HD Hyundai Moved the Concept to a 16,000 TEU Container Ship
The more significant development came in June 2026.
HD Korea Shipbuilding & Offshore Engineering, HD Hyundai Heavy Industries and ABS completed a joint development project for a 16,000 TEU ultra-large container ship incorporating a battery hybrid system.
ABS issued Approval in Principle for the electrical analysis and design.
The project represents a major step because container vessels of this size consume vastly more energy than ferries or harbor craft.
However, one distinction is essential.
This is not a 16,000 TEU battery-electric ship.
Current battery energy density does not make battery-only transoceanic operation economically realistic for a vessel of this size.
Instead, batteries become part of the vessel's total electrical architecture.
And We Should Not Assume the 16,000 TEU Project Uses LFP
The publicly available ABS project announcement does not disclose the battery chemistry selected for the 16,000 TEU concept.
The same is true of HD Hyundai's public description of the Chaumine hybrid Ro-Ro vessel.
It would therefore be incorrect to label either project as an LFP vessel without further technical disclosure.
What we can say is that LFP is becoming increasingly attractive for exactly the type of large-capacity, moderate-C-rate energy storage that future large-vessel hybrid systems may require.
The Battery Does Not Need to Drive the Ship Across the Pacific
On a large ship, batteries can create significant value without becoming the primary energy source.
Potential functions include:
- Peak shaving
- Generator load optimization
- Spinning reserve replacement
- Hotel loads
- Port manoeuvring
- Zero-emission port operation
- Black-start capability
- Emergency propulsion
- Power-quality stabilization
- Energy recovery
HD Hyundai Mipo and Korea Register have already developed control technology that goes beyond simple peak shaving.
The concept coordinates battery power in real time so that the vessel's generators can remain near their optimum efficiency range.
This is where batteries can fundamentally change how engines are operated.
The Future Is Not Battery Versus Engine
A conventional large merchant ship can be simplified as:
Low-Speed Engine → Shaft → Propeller
A future hybrid-electric vessel can increasingly look like:
Engine / Generator + Battery ESS → DC Grid → Power Electronics → Electric Motor → Propeller
Or it may retain a direct mechanical main engine while adding batteries and shaft-generation capability around it.
The result will depend on the vessel type.
The Low-Speed Engine Still Has One Extraordinary Advantage
Modern large two-stroke engines are among the most efficient combustion engines ever commercialized.
They operate at low rotational speed and can drive enormous propellers directly.
Replacing that direct mechanical path with:
engine → generator → converter → electric motor → shaft
adds additional energy-conversion stages.
This means that full electric propulsion is not automatically more efficient when the electricity is still being generated onboard by fuel.
The economic case depends on whether improved engine loading, redundancy, operating flexibility, energy recovery and battery optimization can compensate for those conversion losses.
That Is Why Different Ships Will Electrify Differently
| Vessel Type | Likely Propulsion Direction | Battery Role |
|---|---|---|
| Passenger Ferry | Full Battery / Plug-in Hybrid | Main propulsion |
| Harbor Tug | Battery / Hybrid | High-power propulsion |
| Offshore Support Vessel | Battery Hybrid / Full Electric on selected routes | DP, hotel load, propulsion and peak shaving |
| Short-Sea Cargo | Battery / Plug-in Hybrid | Significant propulsion energy |
| Ro-Ro / PCTC | Engine + Battery Hybrid | Efficiency, port operation and backup |
| LNG Carrier | Dual Fuel + Electric / Battery Hybrid | Power optimization and redundancy |
| Large Container Ship | Low-Speed Dual Fuel or Hybrid Electric | Peak shaving, auxiliary load and power management |
| Ultra-Long-Range Vessel | Alternative-Fuel Engine + ESS | Integrated energy management |
What Happens to Korea's Marine Engine Industry?
This transition should not necessarily be viewed as a threat to HD Hyundai, Hanwha Engine or other Korean propulsion companies.
It could actually expand their addressable market.
Instead of selling only an engine, the future supplier may provide:
- Low-speed dual-fuel engines
- Medium-speed generator engines
- Battery ESS
- Electric motors
- Inverters and converters
- DC-grid equipment
- Shaft generators
- Energy-management software
- Fuel-supply systems
- Remote monitoring and predictive maintenance
In other words, the marine engine company could evolve into a Marine Power System Company.
China's Challenge Is Vertical Integration
China has a different strategic opportunity.
It already leads global shipbuilding and also possesses the world's largest LFP battery manufacturing ecosystem.
If Chinese shipbuilders successfully integrate domestically manufactured low-speed engines, batteries, motors, power electronics and control systems, they could create an extremely powerful vertically integrated marine propulsion industry.
This may be one of the biggest long-term challenges facing Korean marine equipment suppliers.
Japan's Opportunity Is Technology Rather Than Volume
Japan is unlikely to compete with China on shipbuilding volume or Korea on current large-engine production volume.
But Japan remains strong in engine IP, precision manufacturing, power electronics and next-generation fuels.
Its ammonia and hydrogen engine programs could become particularly important if international shipping moves beyond LNG and methanol toward genuinely near-zero-carbon fuels.
DATAAD View: The Engine Room Is Becoming an Energy System
The most important change in marine propulsion may not be the disappearance of the engine.
It may be the disappearance of the traditional concept of the engine room.
For more than a century, the engine was the center of the vessel and almost everything else supported it.
The future vessel may instead contain several coordinated sources of energy:
Low-Speed Engine + Generator + Battery + Shore Power + Alternative Fuel + Power Electronics + Software.
The battery does not have to propel a 16,000 TEU container ship across the Pacific to transform the shipping industry.
It only needs to make the entire power system operate more efficiently.
LFP is likely to play an increasingly important role because marine operators value safety, long cycle life and predictable cost.
But NMC will remain relevant where energy density matters, while LTO can dominate specialized high-cycle and fast-charge applications.
For Korea, this is particularly important.
The country already produces more than half of the world's large low-speed engines and builds some of the world's most sophisticated high-value ships.
If Korean companies can combine that engine capability with batteries, electric propulsion, power electronics and integrated control technology, the battery era does not have to reduce Korea's marine-engine industry.
It could expand it from an engine business into a complete marine energy business.
China's scale, Korea's propulsion manufacturing and Japan's engineering technology are now converging on the same battlefield.
The next competition in global shipbuilding may therefore not be about who builds the best engine or the biggest battery.
It may be about who controls the complete energy architecture of the ship.
Sources: Korean corporate filings and HD Hyundai Heavy Industries disclosures; Mitsui E&S Group; Clarksons Research; Bureau Veritas Maritime Electrification Report 2026; DNV Alternative Fuels Insights and maritime battery analysis; ABS; HD Hyundai; Corvus Energy; U.S. MARAD; Korea Register and industry disclosures. Production figures are presented using publicly verifiable company and industry data. China does not currently publish a directly comparable consolidated national annual low-speed-engine unit count, so DATAAD does not estimate one without a consistent source.